US4664724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent magnetic alloy and method of manufacturing the same
Assignee: Toshiba Corp
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Filing: 1985-09-09
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Granted: 1987-05-12
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Expires: 2005-09-09
Abstract
Abstract A permanent magnetic alloy essentially consists of 10 to 40% by weight of R, 0.1 to 8% by weight of boron, 50 to 300 ppm by weight of oxygen and the balance of iron, where R is at least one component selected from the group consisting of yttrium and the rare-earth elements. An alloy having this composition has a high coercive force IHC and a high residual magnetic flux density and therefore has a high maximum energy product.
Inventors
- 👤 Tetsuhiko Mizoguchi
- 👤 Koichiro Inomata
- 👤 Toru Higuchi
- 👤 Isao Sakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:44
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/047; H01F1/053; H01F1/055; H01F1/057; H01F1/0571; H01F1/0575; H01F1/0577
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
52 words
A permanent magnetic alloy essentially consisting of 10 to 40% by weight of R, 0.1 to 8% by weight of boron, 50 to 300 ppm by weight of oxygen and the balance of iron, where R is at least one component selected from the group consisting of yttrium and the rare-earth elements.
Claim 2
Dependent Claim
52 words
A permanent magnetic alloy essentially consisting of 10 to 40% by weight of R, 0.1 to 8% by weight of boron, 50 to 300 ppm by weight of oxygen and the balance of iron, where R is at least one component selected from the group consisting of yttrium and the rare-earth elements.
Claim 3
Dependent Claim
38 words
An alloy according to claim 1, further including not more than 20% by weight of at least one element selected from the group consisting of cobalt, chromium, aluminum, titanium, zirconium, hafnium, niobium, tantalum, vanadium, manganese, molybdenum, and tungsten.
Claim 4
Dependent Claim
16 words
An alloy according to claim 2, further including not more than 20% by weight of cobalt.
Claim 5
Dependent Claim
15 words
An alloy according to claim 3, further including 5 to 20% by weight of cobalt.
Claim 6
Dependent Claim
22 words
An alloy according to claim 1, further including not more than 5% by weight of at least one of aluminum and titanium.
Claim 7
Dependent Claim
21 words
An alloy according to claim 5, further including 0.2 to 5% by weight of at least one of aluminum and titanium.
Claim 8
Dependent Claim
31 words
An alloy according to claim 1, further including not more than 20% by weight of cobalt and not more than 5% by weight of at least one of aluminum and titanium.
Claim 9
Dependent Claim
29 words
An alloy according to claim 7, further including 5 to 20% by weight of cobalt, and 0.2 to 5% by weight of at least one of aluminum and titanium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |